View Compilation Error

0_0_38950523_3011.cpp:13:1: error: expected initializer before 'bool'
   13 | bool cmp(node p,node q){
      | ^~~~
0_0_38950523_3011.cpp: In function 'int main()':
0_0_38950523_3011.cpp:20:24: error: 's' was not declared in this scope
   20 |                 memset(s,0,sizeof(s));
      |                        ^
0_0_38950523_3011.cpp:23:28: error: 'cmp' was not declared in this scope
   23 |                 sort(a,a+n,cmp);
      |                            ^~~
0_0_38950523_3011.cpp:28:48: error: 'j' was not declared in this scope
   28 |                         while(j<n && b[i].x<=a[j].x){
      |                                                ^